Malicious PDF — malware analysis report

Static analysis result for SHA-256 255bbd031b6b2503…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 07:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb00ddf32d2c49a421f8682a4bda40b3 SHA-1: 59ab7fcd47c68b3024f708b822eae0edff36cbe2 SHA-256: 255bbd031b6b2503f2a52f42791e57b64447d4ac65839bfb1c8e45c31bcc3146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it may be used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://torbay.ru/images/uploads/file/pajibuvipodatibufeji.pdf In PDF document text
    • https://vicareyou.com/userfiles/file/24891917050.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-16/9914cdee03f8479b03abb62750ab66a2.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/9608127246.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/49190009634.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/69d42945d6dc3026ff3be5126081597f/tefurufivalonuruxakopekeb.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/jamusuno.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/38636403802.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/29901102963.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/8090575563.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/39904973739.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/60443545098.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/woduribebedokisizasavi.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/95460182243.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109191135004318.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/49844155375.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/phkahmbm91aiq8ncc7cnvop2u4/36540010203.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/sosogevemadurividelisolik.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/wajuxubegalajuzarose.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614220d3c34ee---19907578150.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/xexuxezik.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/wojivosape.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d40d12be---fisiwosikipa.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/gabuso.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8eb3d71760714b53ecdd3e0493fca527/83188010063.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/78104848327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=b+words+that+are+positivePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 10544 bytes
SHA-256: 671e3055fd492fce0914e325946241d1a9702e4191486075dc25555100d4c6e4
font_01_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 16980 bytes
SHA-256: 4452bb218597b4aef5d56076603d05aba008ed1298757e254b105be873e6d902

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